Diagnostic trouble code (DTC) information ECM-520D

Condition 

Fig 1: Identifying Air Conditioning (A/C) Pressure Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the signal from the air conditioning (A/C) pressure sensor is lower than the normal operating range.

The diagnostic trouble code (DTC) can be diagnosed while the engine is running and while air conditioning (A/C) control is active.

Substitute Value 

• None.

Possible Source 

• Open-circuit in the power supply
• Open-circuit in the ground lead
• Damaged A/C pressure sensor.

Fault symptom[s] 

• The air conditioning (A/C) system does not operate.